﻿// Jinx AJAX Framework
// Copyright (C) 2008 Blake Hegerle
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

using System.Collections.Generic;
using System.Linq;

namespace Core
{
    public class SequenceEqualityComparer<T> : IEqualityComparer<IEnumerable<T>>
    {
        #region IEqualityComparer<IEnumerable<T>> Members

        public bool Equals(IEnumerable<T> x, IEnumerable<T> y)
        {
            return x == null || y == null ? x == y : x.SequenceEqual(y);
        }

        public int GetHashCode(IEnumerable<T> Seq)
        {
            var Hash = 0;
            foreach (var e in Seq)
                Hash ^= e.GetHashCode();
            return Hash;
        }

        #endregion
    }
}